First of all, since Abyss Web Server requires write permissions to the installation directory, it is not recommended to install it inside c:\program files on Windows Vista/7/8. The installer suggests C:\Abyss Web Server and this is what you should retain as the best default value.

The error you have may also mean that you have moved the installation directory and that there are some references to paths that do not or no more exist.

If the error persists, please send us a support request by email along with your abyss.conf file._________________Support Team
Aprelium - http://www.aprelium.com